JP2011127422A - Method for repairing concrete structure, and resin panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for repairing a concrete structure and resin panels for use in the method excelling in workability, suppressing surface deterioration due to rainwater or the like and obtaining the concrete structure of excellent appearance. <P>SOLUTION: The surface deterioration of the existing concrete structure 3 advances by being exposed to the elements, and there is a risk of a fall in strength or the like. Therefore, the resin panels 7 are installed longitudinally and laterally with a predetermined clearance from the existing concrete structure 3 so as to cover the surface of the structure 3, and concrete is placed in the clearance to form the concrete structure. The resin panel 7 is a substantially rectangular plate member. The surface 13 of a body 9 is provided with unevenness, patterns, or the like of designability to present excellent appearance when installed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for repairing a concrete structure such as a sabo dam and a resin panel used therefor.

  Conventionally, many sabo dams have been constructed to prevent outflow of earth and sand. Sabo dams are usually made of concrete. The surface of such a concrete structure deteriorates with time.

  Fig.15 (a) is a schematic diagram which shows the conventional sabo dam 60 which is a concrete structure. The sabo dam 60 is composed of an existing concrete structure 61. The structure surface 63 which is the surface of the existing concrete structure 61 is exposed to wind and rain. Further, the concrete structure repeatedly expands and contracts slightly due to changes in the temperature of the installation location. Especially in cold regions, the temperature environment is below 0 ° C depending on the season.

  FIG. 15B is a schematic diagram of the resulting crack 65. Innumerable fine cracks 65 are formed on the structure surface 63. When the crack 65 is formed, rainwater or the like enters the crack 65 by a capillary phenomenon or the like. When the outside air falls below 0 ° C., the water inside the crack freezes and expands. As a result, the crack 65 is further extended. As a result of repeated generation and growth of such cracks, the structure surface 63 deteriorates, and the thickness of the existing concrete structure 61 gradually decreases as shown in FIG. For this reason, it is necessary to periodically repair the concrete surface.

  In order to repair such a concrete structure, there is usually a method in which concrete is newly placed on the surface of the concrete structure. For example, there is a method of reinforcing a concrete structure by placing concrete with a higher strength than the inside on a concrete surface or installing a high-strength concrete block (Patent Document 1).

  In the step of installing the concrete block, first, as shown in FIG. 16A, the target concrete structure surface 63 is drilled, the anchor 69 is installed, and the bolt 71 is joined to the anchor 69. Next, the concrete block 73 to which the connection plate 75 is attached in advance is disposed at a predetermined position, and the connection plate 75 and the bolt 71 are welded. Thus, the concrete block 73 is fixed to the structure. Thereafter, concrete is placed between the structure surface 63 and the concrete block 73 to complete the repair of the concrete structure.

JP 2001-192254 A

  However, the method of Patent Document 1 has a problem that the concrete surface may be deteriorated again. Moreover, when a concrete block is used, since it is a heavy article, there exists a problem that workability | operativity is bad. Furthermore, the surface of the concrete structure after the repair has a problem that the repaired concrete is exposed and the scenery is damaged. Moreover, as shown in FIG. 16, since the concrete block 73 and the bolt 71 attached to the anchor 69 are joined by welding via the connection plate 75, workability is bad and dangerous. In particular, since the bolt 71 is attached to the anchor 69 and is welded to the connection plate 75, if the installation angle of the anchor 69 is deviated, the position with respect to the connection plate 75 is deviated and welding is impossible. For this reason, in the construction of the pilot hole of the anchor 69, the installation of the anchor 69, etc., accuracy is required for the work, so that there is a problem that man-hours are required and workability is poor.

  The present invention has been made in view of such a problem, and is a concrete structure that is excellent in workability, suppresses surface deterioration due to the surrounding environment, etc., and can provide a concrete structure that is excellent in appearance. An object of the present invention is to provide a repairing method and a resin panel used therefor.

  In order to achieve the above-mentioned object, a first invention is a method for repairing a concrete structure, which uses a resin panel having a female threaded portion on the back surface and a bolt attached to the female threaded portion. A step of providing a hole on the surface, a step of filling an adhesive anchor in the hole (b), a step of inserting a bolt attached to the resin panel in the hole (c), (D) placing concrete between the resin panel and the concrete structure, and covering the concrete structure with a plurality of the resin panels, and the resin panel is covered with the concrete structure. This is a method for repairing a concrete structure characterized by being fixed to an object.

  In the step (c), an adjustment jig capable of adjusting the clearance between the back surface of the resin panel and the surface of the concrete structure is attached to the resin panel, the bolt is inserted into the hole, and the resin It is desirable that the clearance between the back surface of the resin panel and the surface of the concrete structure is constant when the panel is attached to the concrete structure.

  The resin panel is rectangular, a step is formed on the surface side of the resin panel on one of the two sides perpendicular to the resin panel, and the resin is formed on the other two sides of the resin panel. It is desirable that a step is formed on the back side of the manufactured panel, and in the step (c), the step on the front side and the step on the back side are fitted to the adjacent resin panel.

  After the step (d), a seal member may be provided above the boundary between the resin panel and the concrete positioned at least in the uppermost stage. In this case, in the step (d), a rod-shaped member is disposed in the planned installation portion of the seal member, and after the concrete is solidified, the rod-shaped member is removed, and along the boundary with the resin panel. A groove may be formed in the concrete, and the seal member may be provided in the groove.

  Further, a bent resin panel having a bent portion on at least one side and having a substantially L-shaped cross-sectional shape is further used, and the bent resin panel is provided above the resin panel positioned at the uppermost stage, and the bent resin You may cover the side surface and upper surface of the said concrete structure with a panel and the said resin panel.

  According to the first invention, it is possible to obtain a method for repairing a concrete structure having excellent workability and high durability. Resin panels are used for repairing concrete structures, and the resin panels have a role as a formwork for cast concrete and protect the concrete surface and improve the appearance, and are lightweight. This eliminates the need to use and remove the formwork, making it extremely easy to work with.

  In addition, the resin panel is hardly deteriorated by rainwater, temperature change, ultraviolet rays or the like, and there is no fear that the resin panel will be thin even after many years of use. For this reason, repair etc. become unnecessary over a very long period compared with concrete.

  Moreover, since the resin panel is lightweight, the bolt joined to the resin panel can be fixed to the existing concrete with an adhesive anchor. For this reason, welding work is not required for fixing the resin panel to the existing concrete.

  Moreover, by attaching an adjustment jig to the resin panel, the clearance between the existing concrete surface and the resin panel back surface can be kept constant. For this reason, the installation site | part of a resin panel can be made constant easily.

  In addition, if a step is formed around the resin panel so that adjacent resin panels can be fitted, a gap is formed between the resin panels when a plurality of resin panels are installed. This can be prevented. Moreover, since it is a level | step difference, it can also follow the displacement of the position of some resin panels.

  Moreover, if a sealing member is provided above the boundary between the resin panel and the cast concrete, it is possible to prevent rainwater and the like from entering from the gap generated at the boundary. In this case, if a rod-shaped member is previously installed above the boundary portion and concrete is placed thereon, a groove portion is formed above the boundary portion, and the seal member can be provided along the groove portion. For this reason, the seal member does not protrude upward.

  Further, if a bent resin panel is used, the concrete structure can be covered only with the resin panel without using a seal member, and water does not enter between the resin panel and the cast concrete.

  A second invention is a resin panel provided so as to cover the surface of a concrete structure, and includes a rectangular main body and a female screw portion formed on a back surface of the main body, and the main bodies are perpendicular to each other. One of the two sides has a step on the front side of the main body, and the other two sides of the main body have a step on the back side of the main body. Rib-shaped protrusions orthogonal to each other may be formed on the back side of the main body.

  According to 2nd invention, the resin-made panels which can be used for repair, construction, etc. of a concrete structure can be obtained. In addition, since the resin panel is lightweight and has a simple structure, it is excellent in workability and durability. In addition, by forming rib-shaped protrusions that are orthogonal to each other, when concrete is placed on the back side, the protrusions are buried in the concrete, and the protrusions are restrained by the concrete, so the thermal expansion between the resin panel and the concrete It is possible to prevent a relative shift or lift between the resin panel and the concrete caused by the difference.

  INDUSTRIAL APPLICABILITY According to the present invention, a method for repairing a concrete structure, which is excellent in workability, suppresses surface deterioration due to rainwater, etc., and is capable of obtaining an excellent concrete structure, and a resin panel used therefor Can be provided.

The perspective view which shows the sabo dam 1. FIG. It is a figure which shows the resin panel 7, (a) is a surface perspective view, (b) is a back surface perspective view. It is a figure which shows the resin panel 7, (a) is a plane (front surface) figure, (b) is a bottom face (back surface) figure, (c) is the sectional view on the AA line of (a). It is a figure which shows the reinforcement process of the existing concrete 3, (a) is a perspective view, (b) is side sectional drawing. The side sectional view showing the reinforcement process of existing concrete 3. The figure which shows the adjustment jig 27. FIG. The figure which shows the state which installed the resin panel 7 in the structure surface 19 using the adjustment jig. The figure which shows the state which casted concrete 5. The figure which shows the state which provided the sealing member 39. FIG. The figure which shows the process of forming the groove | channel 41. FIG. It is a figure which shows the resin panel 8, (a) is a perspective view, (b) is a figure which shows the state which attached the resin panel 8. FIG. The figure which shows the process of constructing a concrete structure using the resin panel. It is a figure which shows the resin panel 50, (a) is a reverse view, (b) is CC sectional view taken on the line of (a). It is a figure which shows the resin panel 50a, (a) is a back view, (b) is the DD sectional view taken on the line of (a). It is a figure which shows the conventional sabo dam, (a) is a perspective view, (b), (c) is side sectional drawing of the structure surface 53. FIG. The figure which shows the process of repairing the conventional sabo dam.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a sabo dam 1. The sabo dam 1 is repaired by placing a resin panel 7 on the surface of an existing concrete structure 3 which is a concrete structure. Such a repaired sabo dam 1 includes an existing concrete structure 3, a plurality of resin panels 7 arranged to cover the existing concrete structure 3, and the existing concrete structure 3 and the resin panel 7. It is composed of cast concrete 5 that has been cast. In addition, as shown in FIG. 1, the resin panel 7 may be provided on the entire surface of the existing concrete structure 3, or may be provided only on the side surface.

  The existing concrete structure 3 is a structure whose surface has deteriorated (for example, a state as shown in FIG. 13B) due to a change in diameter over many years. As described above, the surface deterioration of the existing concrete structure 3 further proceeds as it is, and there is a risk that the strength may be reduced. Therefore, the existing concrete structure 3 is repaired by placing the resin panel 7 vertically and horizontally with a gap between the surface of the existing concrete structure 3 so as to cover the surface, and placing the concrete in the gap.

  2 and 3 are views showing the resin panel 7, FIG. 2 (a) is a front perspective view, and FIG. 2 (b) is a rear perspective view. 3A is a front view, FIG. 3B is a rear view, and FIG. 3C is a cross-sectional view taken along line AA of FIG. 3A.

  The resin panel 7 includes a main body 9 that is a substantially rectangular plate-like member. For example, the main body 9 has a width of about 1 mx, a height of about 500 mm, and a thickness of about 30 mm. The surface 13 of the main body 9 is provided with irregularities and patterns having design properties, and has an excellent appearance when installed. The design of the surface 13 of the resin panel 7 is not limited to the example shown in FIG. In other drawings, the surface pattern of the resin panel 7 is not shown.

  Steps 11 a and 11 b are formed on two adjacent sides (two sides perpendicular to each other) of the main body 9. In the example of FIGS. 2 and 3, steps 11a and 11b are formed on the upper side and the right side of the main body 9, respectively. The steps 11a and 11b are steps formed on the surface 13 side, and are steps that can be seen from the surface side when viewed from the front (FIG. 3A).

  Steps 11c and 11d are formed on sides different from the steps 11a and 11b. In the example of FIGS. 2 and 3, steps 11 c and 11 d are formed on the lower side and the left side of the main body 9, respectively. The steps 11c and 11d are steps formed on the back surface 15 side, and are steps visible from the back surface side when viewed from the back surface (FIG. 3B). That is, all the sides of the outer periphery of the main body 9 are stepped, one of the two sides perpendicular to each other is a step on the front side, and the other two sides that are perpendicular to each other are steps on the back side. The height of the step is about half of the thickness, for example, about 15 mm. Further, the steps are each formed on the entire circumference with a width of about 25 mm. The step may be not only two steps but also three steps or more.

  A plurality of holes 17 are formed in the back surface 15 of the main body 9. A helicate (internal thread portion) may be embedded in the hole 17 in advance, or an internal thread may be formed on the inner surface of the hole 17 with a tap screw, and the helicate may be attached. The hole 17 is a joint portion with a bolt 23 described later, and is formed with a predetermined depth from the back surface 15 as shown in FIG.

  The resin panel 7 is not specified as long as it has a certain degree of strength and durability, but a resin such as a polyolefin-based resin, a polyvinyl chloride resin, a waste plastic, and a recycled plastic made of a flame retardant can be used.

  Next, the repair method of the existing concrete structure 3 using the resin panel 7 is demonstrated. FIG. 4A is a perspective view showing the existing concrete structure 3, and FIG. 4B is a cross-sectional view of the structure surface 19. The structure surface 19 of the existing concrete structure 3 is deteriorated. First, holes 21 are formed in the structure surface 19. The size of the hole 21 is only required to be able to insert a bolt 23 described later, and a hole 21 larger than the bolt 23 is provided so that there is some play.

  Next, as shown in FIG. 5, the adhesive anchor is filled in the hole 21. As the adhesive anchor, for example, “AR Chemical Setter” (registered trademark) manufactured by Asahi Kasei Chemicals Corporation can be used. Bolts 23 are attached to the back surface 15 side of the resin panel 7. The bolt 23 may be made of stainless steel or resin. As described above, the bolt 23 is attached to the hole 17 formed in the back surface 15 of the resin panel 7. It is desirable that the bolt 23 is attached to the helicate in the hole 17 and joined to the helicate.

  Next, as shown in FIG. 6, the tip of the bolt 23 is inserted into the hole 21 before the adhesive anchor 25 is solidified. At this time, since the hole 21 is sufficiently large with respect to the bolt 23, the installation is easy even if the direction and the position of the hole 21 are slightly deviated. In the example of FIG. 6, an example in which the resin panel 7 a is installed below is shown. However, when the resin panel 7 is installed, a step between existing resin panels adjacent to the bottom or side is fitted. Install to match. In the example of FIG. 6, the step 11a above the existing resin panel 7a and the step 11c below the resin panel 7 to be installed are fitted.

  When the resin panel 7 is installed, the adjustment jig 27 is attached to the upper side of the resin panel 7. The adjustment jig 27 keeps the distance between the resin panel 7 and the structure surface 19 constant, and is provided with a gauge 35 that contacts the structure surface 19. As described above, the position below the resin panel 7 is fixed because it fits with the existing resin panel, but the distance above the structure surface 19 is constant because the resin panel 7 is not restrained by other members. The adjustment jig 27 is attached to the upper side (so that the resin panel does not fall on the structure side).

  The resin panel 7 is installed with the upper side slightly inclined toward the structure side, and the resin panel 7 does not fall forward due to the attachment of the bolt 23 and the adhesive anchor 25. Further, since the hole 21 is sufficient in size and depth for the installation of the bolt 23, the bolt 23 is not restrained by the hole 21.

  FIG. 7 is a view showing the structure of the adjustment jig 27. The adjustment jig 27 mainly includes a frame 33, a gripping portion 29, a fixing portion 31, a gauge 35, and the like. A grip portion 29 is attached to the U-shaped frame 33. The grip portion 29 is screwed into the frame 33, for example, and the gap between the grip portion 29 and one inner surface of the frame 33 can be adjusted. Accordingly, the upper portion of the resin panel 7 can be sandwiched and held by the holding portion 29.

  A fixing portion 31 is provided outside the frame 33, and a gauge 35 is attached so as to penetrate the fixing portion 31. The fixing part 31 can fix the gauge 35, and the fixing part 31 can be fixed by adjusting the position of the gauge 35 in the axial direction. For example, in FIG. 7, the position of the gauge 35 can be adjusted and fixed such that the tip of the gauge 35 is positioned at a distance B from the back surface 15 of the resin panel 7. In this way, in FIG. 6, the distance between the structure surface 19 and the back surface 15 of the resin panel 7 is fixed to B. In the above state, the position of the resin panel 7 is kept constant by the adjusting jig 27 until the adhesive anchor 25 is solidified.

  After all the resin panels to be installed at the same height are installed on the existing concrete structure 3 and the adhesive anchors 25 are solidified, the adjustment jig 27 is removed as shown in FIG. And placing the concrete 5 between the surface 19 and the structure surface 19. After the cast concrete 5 is solidified, the above process is repeated to install the resin panel 7 upward.

  When the resin panel 7 is installed up to the uppermost stage as described above, as shown in FIG. 9A, the sealing member 39 is applied to the boundary portion 37 between the placing concrete 5 and the resin panel 7 in the uppermost stage. The seal member 39 fills a gap caused by a change in ambient temperature due to a difference in linear expansion coefficient between the cast concrete 5 and the resin panel 7 and prevents moisture from entering inside.

  As the seal member 39, for example, a silicone sealant can be used. In this case, it is desirable to apply a primer to the target portion of the resin panel in advance to roughen the adhesive surface with the seal member 39. This is because the surface of the resin panel is roughened by the primer so that the seal member 39 is more reliably bonded to the resin panel 7 due to the anchor effect with the seal member 39. By using a silicone-based sealant, it is possible to ensure adhesion to concrete and resin, to obtain high durability against ultraviolet rays and water, etc. when used outdoors, and to reliably prevent water from entering. Can do.

  Note that, as shown in FIG. 9B, the groove 41 may be formed in advance in the installation site of the seal member 39. By forming the groove 41, the seal member 39 can be formed more reliably, and since the seal member 39 does not protrude upward, there is no fear of the seal member 39 peeling off.

  As a method for forming such a groove 41, as shown in FIG. 10 (a), a rod-like member 43 is installed in the formation part of the groove 41 before placing concrete, and as shown in FIG. 10 (b). Then, after placing concrete 5 and solidifying the concrete, the rod-shaped member 43 may be removed (FIG. 10C). As described above, the groove 41 can be formed along the boundary portion between the cast concrete 5 and the resin panel 7. The rod-shaped member 43 may be embedded in the cast concrete 5 after the concrete is cast and before solidification. Further, the seal member 39 may be provided not only above the boundary portion, but also on the side or any other part as long as a gap between the concrete and the resin panel may be generated.

  Further, as a method for treating the upper end portion of the concrete structure, there is a method in which only the resin panel is used instead of using the sealing member 39 described above. 11A and 11B are views showing a resin panel 8 which is a bent resin panel. FIG. 11A is a perspective view showing the resin panel 8, and FIG. 11B is a side sectional view showing a state in which the resin panel 8 is attached. is there.

  The resin panel 8 has substantially the same configuration as the resin panel 7, but is a panel having a shape in which one side is bent. In addition, the same code | symbol is attached | subjected to the structure which is common in the resin panel 7, and the overlapping description is abbreviate | omitted. As shown in FIG. 11 (b), one side of the resin panel 8 is substantially L-shaped (as the design value of the standard gradient of the sabo dam is 0.2: 1, the slope angle is 78.7 ° (= Arctan 5), and the bending angle of the resin panel in this case is about 101 °, so that the angle between the main body and the bending portion is 95 ° to 110 ° so as to sandwich the standard value. Although it is set, it is suitably set according to the surface angle of the structure in the place where it is installed in the range of 98 ° to 105 °.) The entire circumference of the resin panel 8 includes the bent portion and the resin panel 7. Similarly, a step is formed. In FIG. 11A, a step 11a is formed on the side facing the bent portion side, and a step 11b is formed on a side perpendicular to the side (the front side in the figure). A step 11c is formed at the lower end of the bent portion, and a step 11d (not shown) is formed on the back side in the drawing.

  The resin panel 8 is installed in the same manner as the resin panel 7. That is, the hole 21 is provided in the installation site, the adhesive anchor 25 is filled, and the resin panel 8 to which the bolts 23 are attached in advance is installed. At this time, an adjustment jig 27 is used as necessary. Further, the resin panel 8 is installed so that the step 11a at the upper end of the existing resin panel 7 and the step 11c at the bent portion are combined. After the adhesive anchor 25 is consolidated, the adjustment jig or the like is removed, and the placing concrete 5 is placed between the resin panel 8 and the structure surface 19. In addition, when casting concrete 5 is placed, a wife form or the like may be installed in advance. Thus, the resin panel 8 is installed. In addition, although the resin panel 8 provided the bending part only in one side, you may provide a bending part in two adjacent sides.

  As described above, according to the method for repairing a concrete structure of the present embodiment, the surface of an existing deteriorated concrete structure is covered with a resin panel, and concrete is easily placed in a gap, so that the existing concrete can be easily formed. The structure can be repaired. In particular, since the resin panel 7 is made of resin and is lightweight, the workability is excellent. For example, even if it is dropped at the time of construction, it is not damaged and is safe.

  Since the resin panel 7 is lightweight, it can be easily fixed with an adhesive anchor. For this reason, welding work is unnecessary. For this reason, conventionally, it has been necessary to provide a welding point in the vicinity of the outer peripheral portion of the concrete block, but the position of the bolt 23 (hole 17) may be anywhere on the resin panel. Therefore, the bolt 23 can be formed at the center of the resin panel. For this reason, a structure and a resin panel can be integrated more reliably.

  In addition, since the resin panel 7 is lightweight, it can be easily fixed when the resin panel is installed. For this reason, even if the bolt 23 attached to the resin panel 7 has play with respect to the hole 21, the resin panel 7 can be easily fixed at a predetermined position using the adjustment jig 27. For this reason, the hole 21 formed in the structure surface 19 does not require accuracy, and the construction of the hole 21 is extremely easy. In addition, thereby, no positional deviation or the like occurs when the resin panel 7 is installed.

  Further, by using the adjustment jig 27, even when the structure surface 19 is uneven, the resin panel installation position can be finely adjusted for each installation position of the resin panel, and the resin panel 7 can be easily and reliably determined. Can be installed in position.

  Since concrete is cast between the resin panel 7 and the structure surface 19, the structure is reliably repaired. At this time, since the resin panel 7 has a function as a mold and functions as a decorative board and a surface protection board after completion, an operation such as removal of the mold is unnecessary.

  Further, since a step is formed on the outer periphery of the resin panel 7, the resin panels are fitted and installed at the step. For this reason, at the time of installation of the resin panel, the resin panel 7 does not collapse or shift its position. In addition, since the resin panels are in contact with each other by a step, the position change between the resin panels can be absorbed by the step due to thermal expansion or deformation of the resin panel. In addition, you may install packing and a nonwoven fabric in the level | step-difference part of the perimeter of the resin panel 7. FIG. If it does in this way, the penetration | invasion of the water from the clearance gap between resin panels can be prevented further.

  Since the resin panel 7 is excellent in durability and does not deteriorate like concrete, it does not need to be repaired again over a long period of time. Moreover, since a pattern etc. are formed in the surface, the resin panel is excellent in appearance without destroying the scenery of the installation location. In addition, you may paint the resin panel surface as needed.

  Moreover, these linear expansion coefficients differ with the difference in the material of the placement concrete 5 and the resin panel 7. FIG. For this reason, a gap may occur in the boundary due to a change in ambient temperature. Therefore, water may enter from this gap, and there is a risk of destroying the concrete as described above. However, in the present invention, a seal member 39 is provided along the boundary at the boundary between the cast concrete 5 and the resin panel 7. Therefore, even if a gap is generated, it is possible to follow the relative displacement between the placing concrete 5 and the resin panel 7 and stop the generated gap. For this reason, extremely high durability can be obtained.

  Further, if the resin panel 8 is used, the existing structure is completely covered with the resin panels 7 and 8, so that the boundary between the resin panel and the cast concrete is not exposed. For this reason, even if a gap is generated between the resin panel and the cast concrete, the resin panel prevents water from entering. Therefore, there is no need to provide a seal member or the like.

  Further, the resin panel 7 is only formed with a hole 17 having a female screw portion therein, and the bolt 23 can be easily attached on site. For this reason, the conveyance efficiency of the plate-shaped resin panel 7 is high, and it is not necessary to secure a wide place on the site.

  Next, a second embodiment using the resin panel 7 will be described. FIG. 12 is a diagram illustrating a process of constructing a concrete structure using the resin panel 7. That is, it shows a process for constructing a new structure, not repairing the existing structure.

  First, concrete 47 is placed in advance on the ground where the structure is installed. Next, as shown in FIG. 12A, a support member 43 is joined to the resin panel 7 and installed at a predetermined location. The support member 43 is attached to the hole 17 on the back surface of the resin panel. An anchor 45 is installed on the concrete 47, and an end portion of the support member 43 is connected to the anchor 45. That is, the resin panel 7 is fixed to the concrete 47 by the support member 43. If the length of the support member 43 is adjustable, the resin panel 7 can be easily aligned. Thus, the resin panel 7 is installed over the entire circumference of the structure. The resin panel 7 is installed with the upper side slightly inclined toward the structure installation side.

  Next, as shown in FIG. 12B, the placement concrete 49 is placed in the space surrounded by the resin panel 7. That is, the resin panel 7 functions as a casting concrete formwork.

  After the casting concrete 49 is solidified, the anchor 45 is installed on the casting concrete 49, and the resin panel 7 is stacked upward in the same procedure and fixed to the casting concrete 49 by the support member 43. At this time, as described above, the resin panels 7 are fitted in steps. Repeat the above to construct a concrete structure. Since the concrete structure thus constructed is covered with a resin panel, there is no surface deterioration. Moreover, what is necessary is just to provide a sealing member with respect to the clearance gap accompanying the difference in the linear expansion coefficient of concrete and resin. The anchor 45 may be a mechanical anchor or a chemical anchor.

  According to the second embodiment, a new concrete structure can be easily constructed using the resin panel 7. In addition, since the surface of the concrete structure is covered with the resin, the surface is deteriorated and there is no need for repair. Further, since the gap between the resin and the concrete is waterproofed by the sealing member, water does not enter. Therefore, it is possible to obtain a concrete structure excellent in workability, extremely easily excellent in durability, and excellent in appearance.

  Next, another embodiment of the resin panel will be described. FIG. 13 is a view showing the resin panel 50, FIG. 13 (a) is a rear view, and FIG. 13 (b) is a sectional view taken along the line CC of FIG. 13 (a). In the following description, components having the same functions as those of the resin panel 7 are denoted by the same reference numerals as those in FIG.

  The resin panel 50 has substantially the same configuration as the resin panel 7, but differs in that a rib-like protrusion 51 is formed on the back surface 15. The protrusions 51 are formed so as to be substantially parallel to each side of the resin panel 50 and perpendicular to each other in the vertical and horizontal directions. When the resin panel is installed on the concrete structure as shown in FIG. 1, the protrusion 51 is peeled off or lifted between the concrete and the resin panel due to the difference in linear expansion coefficient between the resin panel and the placed concrete. Etc. are prevented.

  That is, when the resin panel 50 is installed, the cast concrete turns into the space defined by the protrusions 51 and solidifies. From this state, when the temperature rises (or falls), the resin panel expands (or shrinks) with respect to the concrete. However, the resin panel 50 is restrained by the protrusions 51 and the concrete. For this reason, the big displacement with respect to concrete does not arise especially in the edge part of the resin panel 50. FIG. Therefore, there are no problems such as a gap between the resin panel 50 and the concrete or peeling of the resin panel 50.

  In addition, about the height of the protrusion 51, arrangement | positioning, etc., it is not restricted to the example shown in figure. Further, the arrangement of the steps 11c and 11d and the arrangement and the number of the holes 17 can be set as appropriate.

  A resin panel 50a as shown in FIG. 14 can also be used. 14A and 14B are views showing the resin panel 50a. FIG. 14A is a rear view, and FIG. 14B is a cross-sectional view taken along the line DD of FIG. The resin panel 50a is substantially the same as the resin panel 50, but differs in that a notch 53 is formed in a part of the rib-shaped protrusion 51. In FIG. 14A, the resin panel 50a is arranged with its longitudinal direction (the left-right direction in the figure) oriented sideways.

  As described above, the resin panel may be installed on the slope of the concrete structure. At this time, when a resin panel in which lattice-like protrusions 51 are formed is installed and concrete is placed like the resin panel 50, the concrete wraps around the space surrounded by the protrusions 51 as described above.

  FIG.14 (c) is an expanded sectional view of the protrusion 51 vicinity in the state which laid the placement concrete 5 on the back surface side of the resin panel like FIGS. 3-4. As shown in FIG. 14C, when the resin panel is arranged along the slope, an air pocket 55 is formed on the lower surface side of the projection 51 in the horizontal direction (base side of the projection 51). By forming such an air reservoir 55, there is a possibility that the strength of the concrete is reduced and the restraining force by the protrusions 51 described above is weakened.

  On the other hand, in the resin panel 50a, when installing the resin panel 50a, the notch 53 is provided in a part of the protrusion 51 formed in the horizontal direction. Therefore, when placing concrete, it is possible to prevent air from flowing upward from the notch 53 and forming the air reservoir 55.

  The arrangement of the notches 53 is not limited to the example as shown in the figure. For example, the notches 53 may not be provided in a straight line in the vertical direction. Moreover, the notch 53 should just be able to prevent formation of the air pocket 55, and should just be formed in at least one part of the protrusion 51 arrange | positioned in a horizontal direction. Further, instead of the notch 53, a hole may be formed in a part of the protrusion 51 or a slit may be formed so that air can be extracted.

  Moreover, although the resin panel 50 and 50a showed the example which formed the rib-shaped protrusion 51 in the back surface of the resin panel 7, you may form in the back surface of the resin panel 8. FIG. In this case, the protrusion 51 may be provided on the back side of each bent surface.

  As described above, according to the resin panels 50 and 50a, the rib-like projections 51 are formed on the back surface, so that the resin panel is prevented from peeling off or rising due to the difference in the linear expansion coefficient between the resin and the concrete. can do. Moreover, since the rib-shaped protrusion 51 is formed, high strength can be obtained. Furthermore, by providing the notch 53 in the protrusion 51 like the resin panel 50a, it is possible to prevent the occurrence of air pockets accompanying the formation of the protrusion 51.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

1, 60 ... Sabo dams 3, 61 ... Existing concrete structure 5 ... Placed concrete 7, 8, 50, 50a ... Resin panel 9 ... Body 11a, 11b, 11c, 11d ... …… Step 13 …… Front 15 …… Back 17 …… Hole 19, 63 …… Structure surface 21 …… Hole 23 …… Bolt 25 …… Adhesive anchor 27 …… Adjustment treatment Tool 29 ......... Holding part 31 ......... Fixing part 33 ......... Frame 35 ......... Gauge 37 ......... Boundary part 39 ......... Seal member 41 ......... Groove 43 ......... Bar-shaped member 45 ......... Anchor 47 ......... Concrete 49 ......... Concrete 51 ......... Protrusion 53 ......... Notch 55 ...... Air pocket 65 ......... Crack 69 ......... Anchor 71 ......... Bolt 73 ......... Concrete Block 75 ... Connection plate

Claims (8)

A method for repairing a concrete structure,
Using a resin panel having a female screw part on the back surface and a bolt attached to the female screw part,
Providing a hole in the surface of the concrete structure (a);
Filling the hole with an adhesive anchor (b);
Inserting a bolt attached to the resin panel into the hole (c);
Placing the concrete between the resin panel and the concrete structure (d);
A method for repairing a concrete structure, comprising: covering the concrete structure with a plurality of the resin panels, and fixing the resin panel to the concrete structure.   In the step (c), an adjustment jig capable of adjusting the clearance between the back surface of the resin panel and the surface of the concrete structure is attached to the resin panel, the bolt is inserted into the hole, and the resin The method for repairing a concrete structure according to claim 1, wherein a clearance between the back surface of the resin panel and the surface of the concrete structure is made constant when a panel made of the resin is attached to the concrete structure. The resin panel is rectangular, a step is formed on the surface side of the resin panel on one of the two sides perpendicular to the resin panel, and the resin is formed on the other two sides of the resin panel. A step is formed on the back side of the panel,
3. The concrete structure according to claim 1, wherein in the step (c), a step on the front side and a step on the back side are fitted to the adjacent resin panels. How to repair things.   The sealing member is provided above the boundary between the resin panel positioned at the uppermost stage and the placed concrete after the step (d). Repair method of concrete structure of description.   In the step (d), a rod-shaped member is arranged in a portion where the seal member is to be installed, and after the concrete is consolidated, the rod-shaped member is removed, so that the concrete is aligned along the boundary with the resin panel. 5. The method for repairing a concrete structure according to claim 4, wherein a groove portion is formed in the groove portion, and the seal member is provided in the groove portion.   A bent resin panel having a bent portion on at least one side and having a substantially L-shaped cross-sectional shape is further used, and the bent resin panel is provided above the resin panel positioned at the uppermost stage. The method for repairing a concrete structure according to any one of claims 1 to 3, wherein a side surface and an upper surface of the concrete structure are covered with the resin panel. A resin panel provided to cover the surface of the concrete structure,
A rectangular main body and an internal thread formed on the back surface of the main body;
Comprising
A resin panel having a step on the front side of the main body on one of the two sides perpendicular to the main body and a step on the back side of the main body on the other two sides of the main body .   8. The resin panel according to claim 7, wherein rib-shaped projections orthogonal to each other are formed on the back side of the main body.

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